* Installer: make UV_OVERRIDE space-safe on Apple Silicon (#6503)
On Apple Silicon, install.sh exports UV_OVERRIDE pointing at the bundled
overrides-darwin-arm64.txt. uv splits UV_OVERRIDE on whitespace, so a repo
cloned under a path containing a space (e.g. /Users/me/Open Source/unsloth)
truncates the value and every later uv call aborts with
'error: File not found: <truncated>' (the PyTorch install step in #6503).
Copy the overrides file into a space-free temp dir and point uv at the copy
when the path contains a space, mirroring the macOS/Linux handling already
merged for the Python installer in #6534. The temp dir is removed in the
exit trap, and the code falls back to the original path when no space-free
temp dir is available, so the no-space and non-macOS paths are unchanged.
Adds tests/sh/test_install_uv_override_space.sh, which extracts and runs the
install.sh hardening block and checks the spaced, no-space, and
spaced-TMPDIR fallback cases.
* Installer: match all whitespace (not just spaces) in UV_OVERRIDE handling
uv splits UV_OVERRIDE on any whitespace, so use the POSIX class
*[[:space:]]* rather than a literal space in install.sh (catches tabs and
newlines in the path too) and the matching test assertions. Use the portable
awk bracket expression [$] instead of \$ in the extraction so the test runs
the same under BSD awk (macOS) and GNU awk (Linux). Adds a tab-in-path case.
* Installer: clear _UV_OVERRIDE_TMPDIR before the exit trap
The exit trap rm -rf's _UV_OVERRIDE_TMPDIR. Initialize it to empty before
registering the trap so an inherited environment value can never be removed;
only a temp dir this script creates (Apple Silicon, spaced path) is cleaned.
Adds a structural test asserting the init precedes the trap.
* Run the install.sh UV_OVERRIDE space test in CI via a pytest wrapper
The Shell installer tests job uses a fixed script list (not tests/run_all.sh),
so the new shell test would not run on PRs. Add a pytest wrapper under
tests/python/ that invokes it; the auto-discovered repo CPU test job collects
tests/python/ and so executes the Apple Silicon spaced-path regression.
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
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